A 16-year-old girl is alleged to have killed her best friend by stabbing her over 60 times following a Facebook dispute.

Mexican news website, Notus, reports that Erandy Elizabeth Gutierrez and Anel Baez, both 16, were besties who were often seen posing together for photos for Facebook. But when Baez uploaded a picture of them both naked to the social network, Gutierrez became furious and threatened to “bury” Baez before the end of the year.

“It may seem that I am very calm, but in my head I have killed you at least three times,” Gutierrez reportedly wrote to Baez via her Twitter account that has now been deleted.

But Baez didn’t take Gutierrez seriously even after she was told “she would be lucky to survive until the end of the year”.

Authorities claim on 19 March, Baez invited Gutierrez over to her home in Guamuchil, Mexico to make friends again.

Gutierrez then reportedly asked to use her friend’s bathroom but instead walked to the kitchen where it’s alleged she grabbed a knife and returned to stab her once best friend to death. Baez was found with 65 stab wounds to her back.

According to local police, following the killing Gutierrez fled the scene and tried to hide her involvement by grieving with friends and even attending the funeral where police eventually arrested Gutierrez.

She is expected to be charged over the killing. If found guilty minors in Mexico can only be sentenced to a maximum of seven years.